XML Guide

10.5.6
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Function Quick Reference

Use the following types of function in an XPath query predicate:

String.
Use string functions to test substring values, concatenate strings, or translate strings into other strings. For example, the following XPath query predicate determines if an employee’s full name is equal to the concatenation of last name and first name:

EMPLOYEE[./FULLNAME=concat(./ENAME/LASTNAME,./ENAME/FIRSTNAME)]

Numeric.
Use numeric functions with element and attribute values. Numeric functions operate on numbers and return integers. For example, the following XPath query predicate rounds discount and tests if the result is greater than 15:

ORDER_ITEMS[round(./DISCOUNT) > 15]

Boolean.
Use Boolean functions to test elements, check the language attribute, or force a true or false result. For example, the following XPath query predicate returns true if the value is greater than zero:

boolean(string)

The following table describes XPath query predicate string functions:

Function	Syntax	Description
concat	concat ( string1, string2 )	Concatenates two strings.
contains	contains ( string, substring )	Determines a string contains another string.
normalize-space	normalize-space ( string )	Strips leading and trailing white space from a string.
starts-with	starts-with ( string, substring )	Determines if string1 starts with string2.
string	string ( value )	Converts a number or Boolean to a string.
string-length	string-length ( string )	Returns the number of characters in a string, including trailing blanks.
substring	substring ( string, start [ ,length ] )	Returns a portion of a string starting at a specified position.
substring-after	substring-after ( string, substring )	Returns a portion of a string starting at a specified position.
substring-before	substring-before ( string, substring )	Returns the characters in a string that occur before a substring.
translate	translate ( string1, string2, string3 )	Converts the characters in a string to other characters.

The following table describes XPath query predicate number functions:

Function	Syntax	Description
ceiling	ceiling ( number )	Rounds a number to the smallest integer that is greater than or equal to the passed number.
floor	floor ( number )	Rounds a number to the largest integer that is less than or equal to the passed number.
number	number ( value )	Converts a string or Boolean value to a number.
round	round ( number )	Rounds a number to the nearest integer.

The following table describes XPath query predicate Boolean functions:

Function	Syntax	Description
boolean	boolean ( object )	Converts an object to Boolean.
false	false ( )	Always returns FALSE.
lang	lang ( code )	Determines if an element has an xml:lang attribute that matches the code argument.
not	not ( condition )	Returns TRUE if a Boolean condition is FALSE and FALSE if the Boolean condition is TRUE.
true	true ( )	Always returns TRUE.

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Function Quick Reference

Function Quick Reference